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Related Experiment Videos

Complex viscoelasticity of normal and lectin treated erythrocytes using laser diffractometry.

B D Riquelme1, J Valverde, R J Rasia

  • 1Grupo de Optica Aplicada (Bio-Optica), IFIR (Instituto de Física de Rosario), CONICET-Universidad Nacional de Rosario, Argentina. riquelme@ifir.ifir.edu.ar

Biorheology
|September 4, 1999
PubMed
Summary

This study introduces a new method to measure the complex viscoelastic parameters (CVP) of red blood cells (RBC) using an Erythrodeformeter. The technique accurately detects changes in RBC membrane properties, crucial for understanding blood flow.

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Area of Science:

  • Biophysics
  • Rheology
  • Cell Biology

Background:

  • Red blood cell (RBC) membrane properties are critical for in vivo blood flow.
  • Alterations in RBC viscoelasticity can lead to various health conditions.
  • Accurate measurement of RBC viscoelastic parameters is essential for understanding cellular mechanics.

Purpose of the Study:

  • To present a novel method for directly determining the complex viscoelastic parameters (CVP) of red blood cells (RBC).
  • To assess the sensitivity of this new method by analyzing the effects of vegetable lactins on RBC membrane properties.
  • To validate the method's results against existing literature.

Main Methods:

  • Experimental determination of RBC CVP using an Erythrodeformeter operating in oscillating mode (0.5-3.5 Hz).

Related Experiment Videos

  • Application of sinusoidal shear stresses to erythrocytes and measurement via laser diffractometry.
  • Analysis of RBCs treated with specific vegetable lactins (Ulex europaeus, wheat germ agglutinin, Enterolobium contorticilicum) compared to control samples.

    • Main Results:

    • The Erythrodeformeter successfully determined the four components of erythrocyte complex viscoelasticity.
    • Significant differences in CVP were observed between lactin-treated and control RBCs, demonstrating method sensitivity.
    • Results for wheat germ agglutinin-treated cells align with previously published findings.

    Conclusions:

    • The developed laser diffractometry method provides a direct and sensitive means to measure RBC complex viscoelasticity.
    • This technique can be a valuable tool for investigating factors that alter RBC rheologic properties.
    • Understanding these alterations is vital for comprehending their impact on in vivo blood flow.